Comments on ancient Chinese literature are works or articles on literary creation, appreciation and criticism. They reflect the thoughts, cultural ideology and life values of ancient writers. It has profound content and shows great concern about the ethical world of human beings. This thesis discusses three ethical features of the comments: moral connotation in literature, emotion restricted by rationality in literature creation and appreciation of the works by knowing ancient authors’ life experience and their times. The author also explains the impacts of the comments on modern literary development and literary criticism.